Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle

The aim of this study was to reveal the macroscopic and mesoscopic deterioration behaviors of concrete under the coupling effect of chlorine salt erosion and the freezing–thawing cycle. The rapid freezing–thawing test was carried out in a 5% chlorine salt environment. The macroscopic characteristics...

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Autores principales:	Shaojie Chen, Jianxi Ren, Yugen Li, Xiang Ren, Yongjun Song, Jielong Sun
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	concrete chlorine salt erosion freezing–thawing cycle microstructure damage Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/14a9f729caef4c9d8428d04545699a34
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spelling	oai:doaj.org-article:14a9f729caef4c9d8428d04545699a342021-11-11T18:02:47ZMacroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle10.3390/ma142164711996-1944https://doaj.org/article/14a9f729caef4c9d8428d04545699a342021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6471https://doaj.org/toc/1996-1944The aim of this study was to reveal the macroscopic and mesoscopic deterioration behaviors of concrete under the coupling effect of chlorine salt erosion and the freezing–thawing cycle. The rapid freezing–thawing test was carried out in a 5% chlorine salt environment. The macroscopic characteristics of concrete were analyzed by testing the mass, the relative dynamic modulus of elasticity, and the compressive strength of concrete under different freezing–thawing cycles. Using CT scanning technology and three-dimensional reconstruction technology, the pore structure, CT value, and surface deviation of concrete before and after freezing–thawing were analyzed. Based on the changes of solid volume, pore volume, and solid CT value of concrete, the calculation method of relative CT value was proposed, and the damage model was established with relative CT value as the damage variable. The results demonstrate that the mass loss rate decreases in the beginning and then increases in the process of chlorine salt erosion and freezing–thawing, and the smaller the concrete size, the greater the mass loss rate. The relative dynamic modulus of elasticity decreases gradually, slowly at the initial stage and then at a faster rate, and the compressive strength loss rate increases gradually. The pore quantity, porosity, and volume loss rate of concrete increase in a fluctuating manner, whereas the relative CT value decreases. The comprehensive analysis shows that the chlorine salt frost resistance of concrete is negatively related to the water-cement ratio when the freezing–thawing cycle is fixed. The damage model could better reflect the freezing–thawing damage degree of concrete with different water cement ratios, and the damage evolution process is well described by the Weibull function.Shaojie ChenJianxi RenYugen LiXiang RenYongjun SongJielong SunMDPI AGarticleconcretechlorine salt erosionfreezing–thawing cyclemicrostructuredamageTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6471, p 6471 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	concrete chlorine salt erosion freezing–thawing cycle microstructure damage Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	concrete chlorine salt erosion freezing–thawing cycle microstructure damage Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Shaojie Chen Jianxi Ren Yugen Li Xiang Ren Yongjun Song Jielong Sun Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle
description	The aim of this study was to reveal the macroscopic and mesoscopic deterioration behaviors of concrete under the coupling effect of chlorine salt erosion and the freezing–thawing cycle. The rapid freezing–thawing test was carried out in a 5% chlorine salt environment. The macroscopic characteristics of concrete were analyzed by testing the mass, the relative dynamic modulus of elasticity, and the compressive strength of concrete under different freezing–thawing cycles. Using CT scanning technology and three-dimensional reconstruction technology, the pore structure, CT value, and surface deviation of concrete before and after freezing–thawing were analyzed. Based on the changes of solid volume, pore volume, and solid CT value of concrete, the calculation method of relative CT value was proposed, and the damage model was established with relative CT value as the damage variable. The results demonstrate that the mass loss rate decreases in the beginning and then increases in the process of chlorine salt erosion and freezing–thawing, and the smaller the concrete size, the greater the mass loss rate. The relative dynamic modulus of elasticity decreases gradually, slowly at the initial stage and then at a faster rate, and the compressive strength loss rate increases gradually. The pore quantity, porosity, and volume loss rate of concrete increase in a fluctuating manner, whereas the relative CT value decreases. The comprehensive analysis shows that the chlorine salt frost resistance of concrete is negatively related to the water-cement ratio when the freezing–thawing cycle is fixed. The damage model could better reflect the freezing–thawing damage degree of concrete with different water cement ratios, and the damage evolution process is well described by the Weibull function.
format	article
author	Shaojie Chen Jianxi Ren Yugen Li Xiang Ren Yongjun Song Jielong Sun
author_facet	Shaojie Chen Jianxi Ren Yugen Li Xiang Ren Yongjun Song Jielong Sun
author_sort	Shaojie Chen
title	Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle
title_short	Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle
title_full	Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle
title_fullStr	Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle
title_full_unstemmed	Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle
title_sort	macroscopic and mesoscopic deterioration behaviors of concrete under the coupling effect of chlorine salt erosion and freezing–thawing cycle
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/14a9f729caef4c9d8428d04545699a34
work_keys_str_mv	AT shaojiechen macroscopicandmesoscopicdeteriorationbehaviorsofconcreteunderthecouplingeffectofchlorinesalterosionandfreezingthawingcycle AT jianxiren macroscopicandmesoscopicdeteriorationbehaviorsofconcreteunderthecouplingeffectofchlorinesalterosionandfreezingthawingcycle AT yugenli macroscopicandmesoscopicdeteriorationbehaviorsofconcreteunderthecouplingeffectofchlorinesalterosionandfreezingthawingcycle AT xiangren macroscopicandmesoscopicdeteriorationbehaviorsofconcreteunderthecouplingeffectofchlorinesalterosionandfreezingthawingcycle AT yongjunsong macroscopicandmesoscopicdeteriorationbehaviorsofconcreteunderthecouplingeffectofchlorinesalterosionandfreezingthawingcycle AT jielongsun macroscopicandmesoscopicdeteriorationbehaviorsofconcreteunderthecouplingeffectofchlorinesalterosionandfreezingthawingcycle
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Macroscopic and Mesoscopic Deterioration Behaviors of Concrete under the Coupling Effect of Chlorine Salt Erosion and Freezing–Thawing Cycle

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